I have a stock set of dart 345 cc heads on my 572 9.7-1 comp motor. Im going to up the comp to 11.5-1 and was wondering should i have my dart 345 heads ported on or should i just sell them and buy a set of cnc heads. Also, for my marine application- maximum rpm in a drag race ( 7200) what would be the head to get ? Brodix -3 oval, -3 rect, afr 355, or dart 355? What about the rhs 360. It is a prop boat and cant afford to lose any low speed torque. What do you think is the head to use for this?